Research On Construction Technology Of Interaction Between The Unsymmetrical Pressure Tunnel And High Slope At Huluding Tunnel

In the construction of mountain highway tunnels,the combination of unsymmetrical pressure tunnels and high slopes is often encountered.Artificially transforming the geotechnical activities,the initial equilibrium stress in the stratum is destroyed,so that the surrounding rock stress around the cave or inside the slope is redistributed,and the rock mass is unstable,which leads to high slope collapse and tunnel surrounding rock collapse.Therefore,it is necessary to investigate the stability of the interaction between the unsymmetrical pressure tunnel and the high slope,and take measures to adjust the construction plan and ensure the stability of the surrounding rock and the high slope.In this thesis the construction of the inlet end of the Huluding Tunnel Project of Gang-Fo-Zhao highway in the mountainous area of western Guangdong are taken as examples analyzed by finite element theory and numerical models.Combining with on-site monitoring and measurement technology,information mutual feedback,dynamic design,the stability of the unsymmetrical pressure tunnel and the high slope of the roadway are evaluated,and the key construction techniques and processes are studied and discussed.The contents are as follows.Firstly,this paper briefly describes the research and evaluation methods of the unsymmetrical pressure tunnel and the high slope.Secondly,for the evaluation of the stability of the biased tunnel,the design principle of the stratum structure method is selected,and the finite element analysis software ANSYS is used to explore the relationship between the two systems by simulating the tunnel and the high slope.Using the Swedish strip method,a high-slope mechanical model is established to evaluate the stability of the high slope.For the disasters occurring during the construction of high slopes,analyze the causes and formulate effective treatment measures.Thirdly,based on the surrounding rock stability of the excavation tunnel and the numerical simulation of the unsymmetrical pressure tunnel and the high slope,the key technologies of the bias tunnel construction were studied.Through the selection and optimization of excavation method,excavation process,excavation parameters and pre-supporting methods,the deformation of surrounding rock and supporting structure can be controlled to realize safe tunneling.Finally,monitoring and measurement technology was used to make advance forecasting work for areas where there may be unfavorable geology during construction,and provide early warning for deformation of surrounding rock and slope,Judging whether it is stable and safe,assessing the rationality of the process,thereby guiding construction,feedback design,and optimizing the design.